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Old March 7th, 2010, 03:29 AM   #1
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** Stupid Question Alert **


OK... whats the diff between the 96-98 non PI motors and the 99-04 PI motors? The last Mustang I had was a 88 LX 5.0 so I'm trying to catch up here. Be gentle....
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Old March 7th, 2010, 08:06 AM   #2
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heads, intake, cams, pistons..........

They are rated 40hp stronger, but on the dyno, it's more like a 50-60rwhp advantage for the PI cars.
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Old March 7th, 2010, 09:01 AM   #3
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NON PI motor =
The 2-valve 4.6L base engine for the Mustang GT arrived with 215 hp at 4,400 rpm, but its restrictive cylinder heads ran out of breath at 5,000 rpm. This resulted in a narrow powerband between 3,200 and 5,200 rpm where the engine really sang.
PI motor =
In 1999, the Mustang GT was upgraded to 260 hp and 300 ft-lbs torque via Power Improved (PI)
cylinder heads, higher-lift cams, and a higher-flowing intake manifold.
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